Hi,

we are MEP contractors in Abu Dhabi, working on LEED project.
In specifications all AHUs are given 2 sets of disposable filters, prefilter (panel) & main (bag) filter. We are going to use AHUs during construction. So we'll be using MERV 8 filter during construction & will replace them by MERV 13 before handing over.
Now, question is, do we use both pre & bag filters of MERV 8 during construction & then before occupancy MERV 13 ratings? It will add cost as good no. of AHUs will be used. Or can we use just one pre or bag filter of MERV 8 & 13 rating?

Thanks in advance